Home / 20,872.40-28,815-14,193.68

Finding the Fourth Proportional to 20,872.40, 28,815 and 14,193.68

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Solution

The fourth proportional to 20,872.40, 28,815 and 14,193.68 is: 19,594.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,872.40 : 28,815 = 14,193.68 : x
  2. Step 2: Convert to fraction form
    20,872.40/28,815 = 14,193.68/x
  3. Step 3: Cross multiply
    20,872.40x = 28,815 × 14,193.68
  4. Step 4: Simplify right side
    20,872.40x = 408,990,889.20
  5. Step 5: Solve for x
    x = 408,990,889.20/20,872.40
  6. Step 6: Final answer
    x = 19,594.82

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.